ダム排砂が黒部川のアユに与える影響

DOI

書誌事項

タイトル別名
  • Report on the influence that sediment-flushing from dams exercises over ayu (Plecoglossus altivelis altivelis) in the Kurobe River

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説明

Implementation of coordinated sediment-flushing of Unazuki Dam (completed in 2001 by the Ministry of Land, Infrastructure and Transport) and Dashidaira Dam (completed in 1985 by the Kansai Electric Power Co., Inc.) in the Kurobe River has been a practice since 2001. This study has been conducted for the purpose of recognizing the impact that the sediment-flushing or floods make over the habitat and food environment of ayu (Plecoglossus altivelis altivelis) living in the river. The results of the research held after a flood, which came up to the implementation standard of sediment-flushing, revealed thedecline of the catch and the exfoliation of algae, food for them, adhered to rocks and stones in water, the latter with the decrease of their condition factor, although it was not clear whether the phenomenon was caused by the sediment-flushing or the flood. Besides, one month after the survey, a gain in the weight of the contents of the digestive tract and the increase of their condition factor were observed. In addition, it was perceived that ayu flown into the sea after the flood, from an otolith examination, that mainly natural ascending population among them swim back upriver again.

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詳細情報 詳細情報について

  • CRID
    1390282679087718400
  • NII論文ID
    130003949545
  • DOI
    10.11532/proes1992.43.473
  • ISSN
    1884829X
    13415115
  • 本文言語コード
    ja
  • データソース種別
    • JaLC
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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